cmr group took my car away

This company is are taking advantage and stealing ..i loaned money against my mitsibushi lancer 2006 modle they gave me 15,000 and was suppose to pay back 19700 because of the interest. the 30 days payback time was on 21 of march on the next day when i was going to make payments they sent repo guys on the 22nd to come to me and forcefully take my car away from me ...causing and even scaring my 1 year old son with their actions .like they were stealing my vehicle ...they took my car and everything in it after they send me an email saying i must pay 25,000 rand if i want my car back within 4 days or they will sell the car.this is really unfair and i really need assistance please